General
Thailand Meteorological Department Issues Heavy Rain and Rough Sea Alert
The Thai Meteorological Department has warned of heavy rainfall across multiple regions and dangerous sea conditions due to a strengthening southwest monsoon.
On August 5, 2026, the Thai Meteorological Department issued a weather alert regarding a strengthening southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand. This weather pattern, combined with a monsoon trough extending across the upper North and Laos, is expected to bring isolated heavy to very heavy rains to the Northeast. Additionally, isolated heavy rains are anticipated across the North, Central, East, and South regions.
For travelers and residents, these conditions present significant maritime risks. The department reports that the upper Andaman Sea will experience waves between 2 and 4 meters, potentially exceeding 4 meters during thundershowers. In the lower Andaman Sea and the upper Gulf of Thailand, wave heights are expected to reach approximately 2 meters, with higher swells occurring in areas affected by storms.
Those planning coastal activities or maritime travel should exercise extreme caution, as these conditions may lead to dangerous sea states. While the forecast provides a clear outlook on the expected precipitation and wave heights, individuals should continue to monitor official updates from the Thai Meteorological Department for any changes in the intensity or duration of these weather systems. Local authorities may provide further guidance based on specific regional developments.